Theory

CH13 - NITROGEN & SULFUR

Oxygen is a Group 16 element. (a) (i) Write equations for the following reactions. • sodium and oxygen • sulfur and oxygen $\text{.............

2024 Winter

3

Theory

CH13 - NITROGEN & SULFUR

(a) Nitrogen is found in inorganic compounds such as nitrogen oxides (NO\(_x\)), nitrates and nitric acid.(i) Identify one natural and one man-made oc...

2024 Winter

3

Theory

CH13 - NITROGEN & SULFUR

(a) \( NH_3(g) \) reacts with \( HCl(g) \) to produce \( NH_4Cl(s) \), as shown.\[ NH_3(g) + HCl(g) \rightarrow NH_4Cl(s) \]Draw a diagram to show the...

2024 Summer

3

Theory

CH13 - NITROGEN & SULFUR

Nitrogen, $N_2$, is generally an unreactive molecule but it does react under certain conditions. (a) Give two reasons to explain the lack of reactivi...

2024 Spring

4

Theory

CH13 - NITROGEN & SULFUR

The Pauling electronegativity values of elements can be used to predict the chemical properties of compounds.Use the information in Table 1.1 to answe...

2023 Spring

2

Theory

CH13 - NITROGEN & SULFUR

(a) Molecule M is present in petrol, a fuel used in cars. M is a saturated, non-cyclic hydrocarbon. M contains eight carbon atoms.(i) Construct an equ...

2023 Summer

1

Theory

CH13 - NITROGEN & SULFUR

Nitrogen molecules, N$_2$(g), contain two atoms attracted to each other by a triple covalent bond.(a) Describe how the triple covalent bond forms in a...

2022 Summer

1

Theory

CH13 - NITROGEN & SULFUR

Sulfides are compounds that contain sulfur but not oxygen.(a) Carbon disulfide, CS₂, is a volatile liquid at room temperature and pressure.(i) State...

2021 Winter

1

Theory

CH13 - NITROGEN & SULFUR

Sodium halide salts react with concentrated sulfuric acid at room temperature.(a) (i) Write an equation to represent the reaction of NaCl(s) with conc...

2021 Summer

2

Theory

CH13 - NITROGEN & SULFUR

In the Periodic Table, the p block contains elements whose outer electrons are found in the p subshell.(a) Elements in the p block show a general incr...

2019 Winter

4

MCQ

CH2 - ATOMIC STRUCTURE

What could be the proton number of an element that has three unpaired electrons in each of its atoms?

2010 Summer

3

MCQ

CH2 - ATOMIC STRUCTURE

Use of the Data Booklet is relevant to this question.The elements radon (Rn), francium (Fr) and radium (Ra) have consecutive proton numbers in the Per...

2010 Summer

3

MCQ

CH4 - STATES OF MATTER

Which gas closely approaches ideal behaviour at room temperature and pressure?

2010 Summer

2

MCQ

CH5 - CHEMICAL ENERGETICS

Some bond energy values are listed below. [Table_1: ] These bond energy values relate to the following four reactions. P Br_2 \rightarrow 2Br Q ...

2010 Summer

3

MCQ

CH5 - CHEMICAL ENERGETICS

Given the following enthalpy changes,$I_2(g) + 3Cl_2(g) \rightarrow 2ICl_3(s) \quad \Delta H^\circ = -214 \text{ kJ mol}^{-1}$$I_2(s) \rightarrow I_2(...

2010 Summer

2

MCQ

CH1 - ATOMS, MOLECULES & STOICHIOMETRY

Ammonium nitrate, NH$_4$NO$_3$, can decompose explosively when heated. NH$_4$NO$_3$ $\rightarrow$ N$_2$O + 2H$_2$O What are the changes in the oxidati...

2010 Summer

1

MCQ

CH20 - NITROGEN COMPOUNDS

The Haber process for the manufacture of ammonia is represented by the following equation. \( \text{N}_2(g) + 3\text{H}_2(g) \rightleftharpoons 2\tex...

2010 Summer

2

MCQ

CH1 - ATOMS, MOLECULES & STOICHIOMETRY

Use of the Data Booklet is relevant to this question. 2.920 g of a Group II metal, $X$, reacts with an excess of chlorine to form 5.287 g of a compou...

2010 Summer

1

MCQ

CH4 - STATES OF MATTER

Which mass of gas would occupy a volume of 3 dm$^3$ at 25°C and 1 atmosphere pressure? [1 mol of gas occupies 24 dm$^3$ at 25°C and 1 atmosphere pre...

2010 Summer

1

MCQ

CH7 - EQUILIBRIA

The table gives the concentrations and pH values of the aqueous solutions of two compounds, X and Y. Either compound could be an acid or a base.[Table...

2010 Summer

2